Crossword Genius

Writer repeatedly dismissing hesitation in masterful manner (15)

Ross

I believe the answer is:

authoritatively

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'repeatedly dismissing hesitation in masterful manner' is the definition.
I can't judge whether this definition defines the answer.

'writer' is the wordplay.
I cannot really understand how this works, but
'writer' could be 'author' ('author' can be a synonym of 'writer') and 'author' is located in the answer.
This may be the basis of clue (or it may be nonsense).

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I've seen this clue in The Times.
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